Klaus
First Post
This is how I'd handle it.Instead of deciding on one skill that would be used for all riding checks I'd ask the player to describe what they're doing and intending to do on horseback each time and make a case by case decision on which skill to use.
If the character is trying to twist in his saddle to avoid falling out, I'd have them roll Acrobatics. If they're trying to settle down their terrified mount, I'd have them roll Nature. If they're trying to ride many miles as fast as possible, Pony Express style, I might have them roll Endurance or Nature, or maybe both.
Instead of making opposed rolls on a "Ride" check, with victory going to the highest roll, you decide on a series of "tests" and have each rider roll the appropriate skill at the moment. Whoever succeeds the most wins the tournament. Almost like some sort of "challenge of skills".
Ideas:
Jousting: Endurance check to hold the lance steady and hit opponent. Athletics check to stay in the saddle.
Obstacle course: Athletics to clear obstacles, Acrobatics to clear slalom courses.
Animal control presentation: Nature or Insight to guide the horse.
Cross-country: Athletics to run faster, Endurance not to tire, Acrobatics to outmaneuver other competitors.